From patchwork Fri Feb 17 09:31:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Looijmans X-Patchwork-Id: 13144490 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6562C05027 for ; Fri, 17 Feb 2023 09:59:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229796AbjBQJ7f (ORCPT ); Fri, 17 Feb 2023 04:59:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54342 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229724AbjBQJ7Z (ORCPT ); Fri, 17 Feb 2023 04:59:25 -0500 X-Greylist: delayed 1649 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Fri, 17 Feb 2023 01:59:16 PST Received: from spamfilter04.delta.nl (spamfilter04.delta.nl [217.102.255.204]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8EC615DE1B; Fri, 17 Feb 2023 01:59:16 -0800 (PST) Received: from host-ubmmyvj.static.zeelandnet.nl ([217.102.255.198] helo=mail.zeelandnet.nl) by spamfilter04.delta.nl with esmtp (Exim 4.92) (envelope-from ) id 1pSx5g-0002F2-96; Fri, 17 Feb 2023 10:31:57 +0100 X-Sender-IP: 204.168.188.16 Received: from phenom.domain_not_set.invalid (016-188-168-204.dynamic.caiway.nl [204.168.188.16]) (Authenticated sender: glasveze@delta.nl) by mail.zeelandnet.nl (Postfix) with ESMTPA; Fri, 17 Feb 2023 10:31:28 +0100 (CET) From: Mike Looijmans To: devicetree@vger.kernel.org, linux-iio@vger.kernel.org Cc: Mike Looijmans , Jonathan Cameron , Krzysztof Kozlowski , Lars-Peter Clausen , Rob Herring , linux-kernel@vger.kernel.org Subject: [PATCH 1/2] dt-bindings: iio: adc: Add driver for TI ADS1100 and ADS1000 Date: Fri, 17 Feb 2023 10:31:27 +0100 Message-Id: <20230217093128.8344-1-mike.looijmans@topic.nl> X-Mailer: git-send-email 2.17.1 X-Originating-IP: 217.102.255.198 X-DELTA-Domain: zeelandnet.nl X-DELTA-Username: 217.102.255.198 Authentication-Results: delta.nl; auth=pass smtp.auth=217.102.255.198@zeelandnet.nl X-DELTA-Outgoing-Class: ham X-DELTA-Outgoing-Evidence: Combined (0.04) X-Recommended-Action: accept X-Filter-ID: Pt3MvcO5N4iKaDQ5O6lkdGlMVN6RH8bjRMzItlySaT/JtpJ85U5oQJKJbxIe8gTePUtbdvnXkggZ 3YnVId/Y5jcf0yeVQAvfjHznO7+bT5xzeemUa7CfwmLuWRw6Ruql9Wrt/oF2ofKYeezPZTW+uL/H seNZtCKdSRRS0Op9pfwEIJgF/Accv4lLtE4TWYNIjgZ0d6t6F7vRFkkblm+Z5L7uq2AYbiB7eX7C A0Ee9FXnLqvnkE9k+JY3j0cID29DoODujL6FEsNqPMBZcb5VIYa36rQUNKpqI1Q4bofNkWUu8fTD ZLzKN6k+QrhjNGJv3vMX8kxfmgvnPiAPWmoBuxmBwTME+9GFGInGiou45HNmtfv+FqJdBAzMzmkl 3RebQxyzcaJWgnTP1X4liYqSLtlnibl3vcBqVmvQB4A18adDnQKevvKDWdWJ/wxJwe8KAVXirbLu Jjy3NtnGWLbnBD5wBOYayDY3tUZW3y7uaAiYA/VUAhdIJZFus1IsgsCDrtkUVrXMjRtSszqFofHQ kL+CgfasVEKELzhStrT89iLQPrbYmyedRWSaH5Jq+f9dFu3a+YmrU6Iy71ckAFY+TtvrQQT37tVB F8TuA2zDxdadd1WxHO/mLVgwAb47uaav6rkstLAf90f4v3S1FulD9czOuJQrulh5Fko3Tg7NaUQc YIYdvv9xV5Ex49z0ZSNkjgZ0d6t6F7vRFkkblm+Z5MW9qS2/3RCT5H9A6khsXlWGs9HjdrlYbXkZ KU5GQmOJZsmqX57B1EDhkm+xMEreF4WyYiqdZEM01eRU4ONdoVEFBfQHNmmYaIBwRgEu+hlkUryY cSJLFEwVd01VIyXuC84PLa7Kvs1vJgz+jb+KUZ4ZI4crFqIiLO9pmeAxg3M8BMj+y2IddO0/FlXY D8b+M8bPMsyA7EJ+U7NdS2YrNZ05xOYqJ9Tq2b0GjLr7lMbCJ9uFCwxUz+7mzjTsriXxHrjdWiOx jT+Uoc44sbCX7JxqjLaXu1AD0YHYM/EUhlEfE6TG2ORqQuRwhOvtgDJH0WotQdu7BL5WjlV6WURt Nxb4RqrqGwDerCVKfZxBaa6lpe1/5cEtgGt7CHfC+dbEjaN+/GAFlUDQdIxEvZe3STQUwRm7JL7H UFLEjZ4tI2w6weBlgtnhN6vUJqrLQEcK+vPvzy/hTW1WrcVDSDSSDu0wxuDU9J+Dmr/6e4fImcm4 9R/2gMGq0KWAzmMf+ibVDqLZPzE7W9Cqnhlc7GZSDtYOqFKIG2trlPUTQYEjbgmVnZqbKIaNWdFw SHKOTj4XQZ8i4WqksVTtjhZSepuHki+xkgmaS1TA/Dv/4AHP2EFtNptbHtgZAQM3rG32ibSwsxBN fS19KOA46lF/j0xwFgg= X-Report-Abuse-To: spam@spamfilter03.delta.nl Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org The ADS1100 is a 16-bit ADC (at 8 samples per second). The ADS1000 is similar, but has a fixed data rate. Signed-off-by: Mike Looijmans --- .../bindings/iio/adc/ti,ads1100.yaml | 37 +++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,ads1100.yaml diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads1100.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads1100.yaml new file mode 100644 index 000000000000..ad30af8453a1 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/ti,ads1100.yaml @@ -0,0 +1,37 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/ti,ads1100.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: TI ADS1100/ADS1000 single channel I2C analog to digital converter + +maintainers: + - Mike Looijmans + +description: | + Datasheet at: https://www.ti.com/lit/gpn/ads1100 + +properties: + compatible: + enum: + - ti,ads1100 + - ti,ads1000 + +required: + - compatible + +additionalProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + adc@49 { + compatible = "ti,ads1100"; + reg = <0x49>; + }; + }; +... From patchwork Fri Feb 17 09:31:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Looijmans X-Patchwork-Id: 13144491 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44BA5C636D6 for ; Fri, 17 Feb 2023 10:00:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229628AbjBQKA4 (ORCPT ); Fri, 17 Feb 2023 05:00:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55908 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229461AbjBQKAz (ORCPT ); Fri, 17 Feb 2023 05:00:55 -0500 Received: from spamfilter04.delta.nl (spamfilter04.delta.nl [217.102.255.204]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EBEE755A3; Fri, 17 Feb 2023 02:00:52 -0800 (PST) Received: from host-ubmmyvj.static.zeelandnet.nl ([217.102.255.198] helo=mail.zeelandnet.nl) by spamfilter04.delta.nl with esmtp (Exim 4.92) (envelope-from ) id 1pSx61-0002ND-Bo; Fri, 17 Feb 2023 10:32:05 +0100 X-Sender-IP: 204.168.188.16 Received: from phenom.domain_not_set.invalid (016-188-168-204.dynamic.caiway.nl [204.168.188.16]) (Authenticated sender: glasveze@delta.nl) by mail.zeelandnet.nl (Postfix) with ESMTPA; Fri, 17 Feb 2023 10:31:46 +0100 (CET) From: Mike Looijmans To: devicetree@vger.kernel.org, linux-iio@vger.kernel.org Cc: Mike Looijmans , Andy Shevchenko , AngeloGioacchino Del Regno , Caleb Connolly , ChiYuan Huang , ChiaEn Wu , Cosmin Tanislav , Geert Uytterhoeven , Ibrahim Tilki , Jonathan Cameron , Lars-Peter Clausen , Marcelo Schmitt , Ramona Bolboaca , William Breathitt Gray , linux-kernel@vger.kernel.org Subject: [PATCH 2/2] iio: adc: Add driver for TI ADS1100 and ADS1000 chips Date: Fri, 17 Feb 2023 10:31:28 +0100 Message-Id: <20230217093128.8344-2-mike.looijmans@topic.nl> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230217093128.8344-1-mike.looijmans@topic.nl> References: <20230217093128.8344-1-mike.looijmans@topic.nl> X-Originating-IP: 217.102.255.198 X-DELTA-Domain: zeelandnet.nl X-DELTA-Username: 217.102.255.198 Authentication-Results: delta.nl; auth=pass smtp.auth=217.102.255.198@zeelandnet.nl X-DELTA-Outgoing-Class: ham X-DELTA-Outgoing-Evidence: SB/global_tokens (5.58220942115e-05) X-Recommended-Action: accept X-Filter-ID: Pt3MvcO5N4iKaDQ5O6lkdGlMVN6RH8bjRMzItlySaT8Ek/evweAfCr35UpAYUD3+PUtbdvnXkggZ 3YnVId/Y5jcf0yeVQAvfjHznO7+bT5xzeemUa7CfwmLuWRw6Ruql9Wrt/oF2ofKYeezPZTW+uL/H seNZtCKdSRRS0Op9pfwEIJgF/Accv4lLtE4TWYNIjgZ0d6t6F7vRFkkblm+Z5NM7uAX91bCdERq+ A7shw5HBQ2daKZyt52e93s8gLaWLOD0k0yEeil+YFQCKRVPBg05RYxHc7P83X0MN+qD//KRAIHit SXey4py3ysTASO2UXeFQ4Qgt4X4Tp95rRBIvvWBPBRhQMjnWPePTCfZDmArPZIeACtMN2+k7Hl2f CJBCzMQSU0TAfewY74azpmhUFMUm6WR+8c0KEwPTO8SnuobzsYGVSJ8wtWY1sFszHIIOCVaSXCYz 6id0Qp9FVqPRF2suI8AhfWAI+3OB0r2i1Lt3K9A6cgdCiY8xmftez8R17qICVXFBwzSiou3p4l21 Lnm4raDtqovtutf+6p3IWiEp7sv8hwpvb9d6DiO/MNJCAi4VQGJ+1LTkbQYmusVqy7ayNInQ+0lb zXWs+DxTD0/y9NItsM9ttotsEyQnvsnwgLS2YCXoa0H3byJv27sfTQg0uDekYo1Hqy4HTtnbisEY dF3BmDDWlyN0s3TqgqYglfL26r6XjWWOjRxq519qzGAk8LmqWByQuE4NgLCNvMqE1OOhyzG/Oscj BsvZZcW2F/eP5MA2oM4kHoDesUvzBiKGdVbzMHZCLbq+RUAvJzB5kqRXG94JLe5wjSBKHlptjwLc C/q3ulM+N0SFWvYGld402dhO3rKV6pwQxFvCm4fZge4+1O2L9U8n0gI8wLSjrhcJAwxv5UO5sZxd eqrFmDfltnogTj8qLK1JEjQtdLlpGGJIVc62Nqo696BsygOetfhl6mn95SwmcmfcGGUA0e6qXhdN qA/HGy79l8NsddgLhvp0D3f4afLIxAhC50yRfl6ccly0PzSbw88/mVDVjJtxNRxDtVtSVZUycqyT RYlryfBAuZ5Et+LGxtm9bdYCmKJZW+BrFDC/0X/A+ATYOc7UfRNcx89nmby0P9XyoKjuEiLQ7atO 8HFTGDgCMvPsvCrJPmnnTHzVkpybMK7ZTcy7gw0xIsUMCrkLcCOUpBeAxMISlhTTogmIm+7uWnoK mjYRxHdk36dyx5RXwY9bPSk4xAm9D8KTeKJT7gNACPda9C5A1O6kFyeoUgLG9Fmq65AUgaZnd2hL 2hmYKGSbsZnDQjgsSw49Sii5+aiGrIAWIi25oV9mrhSyrCr9ZkLoYuqq9KhbrPlc7mH86PRM2wXS rZeO7490DQ4oonjwx7zj1NX1DIR11dSkmPvtyWJgnC5zP7uIa3lQ/u231eSo5G2x/iFPdyw4ROzm NnUfS+9D/8f1V4XA52uMvrBv5mOLRYyA4gWNdmAd3MxX1sDOTbqvraXMdrNhWyDyKHiG9D9npc/l oKm25XEdh/tdoFOMHHASJNUmoOHSoqgqxfHmWWD85nwkbPmrbEw7dsSRat9CQHDi1xXFs3q3IhkP kh0tg/7K/pvhMveDMLvPOCN7G4f8/9jMrNCEeHzU1fqcBF0cc09c/vXmiMsV0QMqN40gdI/Bo0mx wy49VYRt2QpvK9MHbp7CnWC4JNX3FpKX5O1CJVQsd8mXfdwBJpdMG5E66qnk8yMIt1SRoB9SzM1R dTEvuGslKTrRIXcXpFg5ivY= X-Report-Abuse-To: spam@spamfilter03.delta.nl Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org The ADS1100 is a 16-bit ADC (at 8 samples per second). The ADS1000 is similar, but has a fixed data rate. Signed-off-by: Mike Looijmans --- drivers/iio/adc/Kconfig | 12 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/ti-ads1100.c | 467 +++++++++++++++++++++++++++++++++++ 3 files changed, 480 insertions(+) create mode 100644 drivers/iio/adc/ti-ads1100.c diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 63f80d747cbd..bc1918d87f8e 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -1207,6 +1207,18 @@ config TI_ADS1015 This driver can also be built as a module. If so, the module will be called ti-ads1015. +config TI_ADS1100 + tristate "Texas Instruments ADS1100 and ADS1000 ADC" + depends on I2C + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + help + If you say yes here you get support for Texas Instruments ADS1100 and + ADS1000 ADC chips. + + This driver can also be built as a module. If so, the module will be + called ti-ads1100. + config TI_ADS7950 tristate "Texas Instruments ADS7950 ADC driver" depends on SPI && GPIOLIB diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 4ef41a7dfac6..61ef600fab99 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -107,6 +107,7 @@ obj-$(CONFIG_TI_ADC108S102) += ti-adc108s102.o obj-$(CONFIG_TI_ADC128S052) += ti-adc128s052.o obj-$(CONFIG_TI_ADC161S626) += ti-adc161s626.o obj-$(CONFIG_TI_ADS1015) += ti-ads1015.o +obj-$(CONFIG_TI_ADS1100) += ti-ads1100.o obj-$(CONFIG_TI_ADS7950) += ti-ads7950.o obj-$(CONFIG_TI_ADS8344) += ti-ads8344.o obj-$(CONFIG_TI_ADS8688) += ti-ads8688.o diff --git a/drivers/iio/adc/ti-ads1100.c b/drivers/iio/adc/ti-ads1100.c new file mode 100644 index 000000000000..0b0d3e5b6bd6 --- /dev/null +++ b/drivers/iio/adc/ti-ads1100.c @@ -0,0 +1,467 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ADS1100 - Texas Instruments Analog-to-Digital Converter + * + * Copyright (c) 2023, Topic Embedded Products + * + * IIO driver for ADS1100 and ADS1000 ADC 16-bit I2C + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#define ADS1100_DRV_NAME "ads1100" + +/* The ADS1100 has a single byte config register */ + +/* Conversion in progress bit */ +#define ADS1100_CFG_ST_BSY BIT(7) +/* Single conversion bit */ +#define ADS1100_CFG_SC BIT(4) +/* Data rate */ +#define ADS1100_DR_MASK (BIT(3) | BIT(2)) +#define ADS1100_DR_SHIFT 2 +/* Gain */ +#define ADS1100_PGA_MASK (BIT(1) | BIT(0)) + +#define ADS1100_CONTINUOUS 0 +#define ADS1100_SINGLESHOT ADS1100_CFG_SC + +#define ADS1100_SLEEP_DELAY_MS 2000 + +static const int ads1100_data_rate[] = {128, 32, 16, 8}; +static const int ads1100_data_rate_scale[] = {2048, 8192, 16384, 32768}; +static const int ads1100_gain[] = {1, 2, 4, 8}; + +struct ads1100_data { + struct i2c_client *client; + struct regulator *reg_vdd; + struct mutex lock; + u8 config; + bool supports_data_rate; /* Only the ADS1100 can select the rate */ +}; + +static const struct iio_chan_spec ads1100_channel = { + .type = IIO_VOLTAGE, + .differential = 0, + .indexed = 0, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .info_mask_shared_by_all = + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_HARDWAREGAIN) | + BIT(IIO_CHAN_INFO_SAMP_FREQ), + .info_mask_shared_by_all_available = + BIT(IIO_CHAN_INFO_HARDWAREGAIN) | + BIT(IIO_CHAN_INFO_SAMP_FREQ), + .scan_type = { + .sign = 's', + .realbits = 16, + .storagebits = 16, + .shift = 0, + .endianness = IIO_CPU, + }, + .datasheet_name = "AIN", +}; + +static int ads1100_set_config_bits(struct ads1100_data *data, u8 mask, u8 value) +{ + int ret; + u8 config = (data->config & ~mask) | value; + + if (data->config == config) + return 0; /* Already done */ + + ret = i2c_master_send(data->client, &config, 1); + if (ret < 0) + return ret; + + data->config = config; + return 0; +}; + +static int ads1100_set_conv_mode(struct ads1100_data *data, u8 flag) +{ + return ads1100_set_config_bits(data, ADS1100_CFG_SC, flag); +}; + +static int ads1100_data_rate_index(struct ads1100_data *data) +{ + return (data->config & ADS1100_DR_MASK) >> ADS1100_DR_SHIFT; +} + +static int ads1100_pga_index(struct ads1100_data *data) +{ + return (data->config & ADS1100_PGA_MASK); +} + +/* Calculate full-scale value */ +static int ads1100_full_scale(struct ads1100_data *data) +{ + return ads1100_data_rate_scale[ads1100_data_rate_index(data)] * + ads1100_gain[ads1100_pga_index(data)]; + +} + +#ifdef CONFIG_PM +static int ads1100_set_power_state(struct ads1100_data *data, bool on) +{ + int ret; + struct device *dev = &data->client->dev; + + if (on) { + ret = pm_runtime_resume_and_get(dev); + } else { + pm_runtime_mark_last_busy(dev); + ret = pm_runtime_put_autosuspend(dev); + } + + return ret < 0 ? ret : 0; +} + +#else /* !CONFIG_PM */ + +static int ads1100_set_power_state(struct ads1100_data *data, bool on) +{ + return 0; +} + +#endif /* !CONFIG_PM */ + +static int ads1100_get_adc_result(struct ads1100_data *data, int chan, int *val) +{ + int ret; + u8 buffer[2]; + + if (chan != 0) + return -EINVAL; + + ret = i2c_master_recv(data->client, buffer, sizeof(buffer)); + if (ret < 0) { + dev_err(&data->client->dev, "I2C read fail: %d\n", ret); + return ret; + } + + *val = (s16)(((u16)buffer[0] << 8) | buffer[1]); + return 0; +} + +static int ads1100_set_gain(struct ads1100_data *data, int gain) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(ads1100_gain); ++i) { + if (ads1100_gain[i] == gain) { + return ads1100_set_config_bits( + data, ADS1100_PGA_MASK, i); + } + } + + return -EINVAL; +} + +static int ads1100_set_data_rate(struct ads1100_data *data, int chan, int rate) +{ + int i; + int size = data->supports_data_rate ? ARRAY_SIZE(ads1100_data_rate) : 1; + + for (i = 0; i < size; ++i) { + if (ads1100_data_rate[i] == rate) { + return ads1100_set_config_bits( + data, ADS1100_DR_MASK, i << ADS1100_DR_SHIFT); + } + } + + return -EINVAL; +} + +static int ads1100_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + struct ads1100_data *data = iio_priv(indio_dev); + + if (chan->type != IIO_VOLTAGE) + return -EINVAL; + + switch (mask) { + case IIO_CHAN_INFO_SAMP_FREQ: + *type = IIO_VAL_INT; + *vals = ads1100_data_rate; + if (data->supports_data_rate) + *length = ARRAY_SIZE(ads1100_data_rate); + else + *length = 1; + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_HARDWAREGAIN: + *type = IIO_VAL_INT; + *vals = ads1100_gain; + *length = ARRAY_SIZE(ads1100_gain); + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +static int ads1100_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + int ret; + struct ads1100_data *data = iio_priv(indio_dev); + + dev_info(&data->client->dev, "%s %ld\n", __func__, mask); + + mutex_lock(&data->lock); + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + break; + + ret = ads1100_set_power_state(data, true); + if (ret < 0) + goto release_direct; + + ret = ads1100_get_adc_result(data, chan->address, val); + if (ret < 0) { + ads1100_set_power_state(data, false); + goto release_direct; + } + + ret = ads1100_set_power_state(data, false); + if (ret < 0) + goto release_direct; + + ret = IIO_VAL_INT; +release_direct: + iio_device_release_direct_mode(indio_dev); + break; + case IIO_CHAN_INFO_SCALE: + ret = regulator_get_voltage(data->reg_vdd); + if (ret > 0) { + /* full-scale is the supply voltage (microvolts now) */ + *val = ret / 1000; /* millivolts, range 27000..50000 */ + *val2 = 1000 * ads1100_full_scale(data); + ret = IIO_VAL_FRACTIONAL; + } + break; + case IIO_CHAN_INFO_SAMP_FREQ: + *val = ads1100_data_rate[ads1100_data_rate_index(data)]; + ret = IIO_VAL_INT; + break; + case IIO_CHAN_INFO_HARDWAREGAIN: + *val = ads1100_gain[ads1100_pga_index(data)]; + *val2 = 0; + ret = IIO_VAL_INT; + break; + default: + ret = -EINVAL; + break; + } + mutex_unlock(&data->lock); + + return ret; +} + +static int ads1100_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int val, + int val2, long mask) +{ + struct ads1100_data *data = iio_priv(indio_dev); + int ret; + + mutex_lock(&data->lock); + switch (mask) { + case IIO_CHAN_INFO_HARDWAREGAIN: + ret = ads1100_set_gain(data, val); + break; + case IIO_CHAN_INFO_SAMP_FREQ: + ret = ads1100_set_data_rate(data, chan->address, val); + break; + default: + ret = -EINVAL; + break; + } + mutex_unlock(&data->lock); + + return ret; +} + +static const struct iio_info ads1100_info = { + .read_avail = ads1100_read_avail, + .read_raw = ads1100_read_raw, + .write_raw = ads1100_write_raw, +}; + +static int ads1100_setup(struct ads1100_data *data) +{ + int ret; + u8 buffer[3]; + + /* Setup continuous sampling mode at 8sps */ + buffer[0] = ADS1100_DR_MASK | ADS1100_CONTINUOUS; + ret = i2c_master_send(data->client, buffer, 1); + if (ret < 0) + return ret; + + ret = i2c_master_recv(data->client, buffer, sizeof(buffer)); + if (ret < 0) + return ret; + + /* Config register returned in third byte, strip away the busy status */ + data->config = buffer[2] & ~ADS1100_CFG_ST_BSY; + + /* Detect the sample rate capability by checking the DR bits */ + data->supports_data_rate = !!(buffer[2] & ADS1100_DR_MASK); + + return 0; +} + +static int ads1100_probe(struct i2c_client *client) +{ + struct iio_dev *indio_dev; + struct ads1100_data *data; + int ret; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + data->client = client; + mutex_init(&data->lock); + + indio_dev->name = ADS1100_DRV_NAME; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = &ads1100_channel; + indio_dev->num_channels = 1; + indio_dev->info = &ads1100_info; + + data->reg_vdd = devm_regulator_get(&client->dev, "vdd"); + if (IS_ERR(data->reg_vdd)) + return PTR_ERR(data->reg_vdd); + + ret = regulator_enable(data->reg_vdd); + if (ret < 0) + return ret; + + ret = ads1100_setup(data); + if (ret) { + dev_err(&client->dev, "Failed to communicate with device\n"); + goto exit_regulator; + } + + ret = pm_runtime_set_active(&client->dev); + if (ret) + goto exit_regulator; + + pm_runtime_set_autosuspend_delay(&client->dev, ADS1100_SLEEP_DELAY_MS); + pm_runtime_use_autosuspend(&client->dev); + pm_runtime_enable(&client->dev); + + ret = iio_device_register(indio_dev); + if (ret < 0) { + dev_err(&client->dev, "Failed to register IIO device\n"); + return ret; + } + + return 0; + +exit_regulator: + regulator_disable(data->reg_vdd); + return ret; +} + +static void ads1100_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct ads1100_data *data = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + + ads1100_set_conv_mode(data, ADS1100_SINGLESHOT); + + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); +} + +#ifdef CONFIG_PM +static int ads1100_runtime_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct ads1100_data *data = iio_priv(indio_dev); + + ads1100_set_conv_mode(data, ADS1100_SINGLESHOT); + regulator_disable(data->reg_vdd); + + return 0; +} + +static int ads1100_runtime_resume(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct ads1100_data *data = iio_priv(indio_dev); + int ret; + + ret = regulator_enable(data->reg_vdd); + if (ret) { + dev_err(&data->client->dev, "Failed to enable Vdd\n"); + return ret; + } + + /* + * We'll always change the mode bit in the config register, so there is + * no need here to "force" a write to the config register. If the device + * has been power-cycled, we'll re-write its config register now. + */ + return ads1100_set_conv_mode(data, ADS1100_CONTINUOUS); +} +#endif + +static const struct dev_pm_ops ads1100_pm_ops = { + SET_RUNTIME_PM_OPS(ads1100_runtime_suspend, + ads1100_runtime_resume, NULL) +}; + +static const struct i2c_device_id ads1100_id[] = { + { "ads1100", }, + { "ads1000", }, + {} +}; +MODULE_DEVICE_TABLE(i2c, ads1100_id); + +static const struct of_device_id ads1100_of_match[] = { + { .compatible = "ti,ads1100", }, + { .compatible = "ti,ads1000", }, + {} +}; +MODULE_DEVICE_TABLE(of, ads1100_of_match); + +static struct i2c_driver ads1100_driver = { + .driver = { + .name = ADS1100_DRV_NAME, + .of_match_table = ads1100_of_match, + .pm = &ads1100_pm_ops, + }, + .probe_new = ads1100_probe, + .remove = ads1100_remove, + .id_table = ads1100_id, +}; + +module_i2c_driver(ads1100_driver); + +MODULE_AUTHOR("Mike Looijmans "); +MODULE_DESCRIPTION("Texas Instruments ADS1100 ADC driver"); +MODULE_LICENSE("GPL");